Rails 4 Postgres Array attribute: how can I ensure that the attribute is an array during validation?
Moncef Belyamani
Hi,
I just started experimenting with the native Postgress array type in Rails 4, and I'm running into an issue I can't figure out. I want the app to raise an error if the value for an array attribute is not an array.
Before, when I was using a regular text type for the field, and serializing it with Rails, I was able to make sure the attribute was an array with a custom validation like this:
def format_of_admin_email
regexp = /.+@.+\..+/i
if admin_emails.present? &&
(!admin_emails.is_a?(Array) || admin_emails.detect { |a| a.match(regexp).nil? })
errors[:base] << "admin_emails must be an array of valid email addresses"
end
end
But now that the field is a Postgres array, it seems like Rails automatically converts the string input into an empty array, so the validation never fails. Here's my migration:
class AddAdminEmailsToLocations < ActiveRecord::Migration
def change
add_column :locations, :admin_emails, :text, array: true
end
end
If I create a Location where admin_emails is a string:
Location.create!(admin_emails: "this should fail")
it doesn't raise a validation error, and it sets admin_emails to an empty array.
Am I doing something wrong or is this a bug in Rails?
I also tried checking if the input is an array in a before_validation callback, and added a puts admin_emails.present?, but it returned false, as if it never saw the String input.
Jordon Bedwell
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